p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO 

It could help to reduce the latency of the time-related functions
in user space.

We have referenced arm's and riscv's implementation for the patch.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren 2021-01-17 23:38:18 +08:00
parent 8dcbc611f0
commit 0d3b051adb
14 changed files with 225 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/csky/Kconfig
View File

@ -35,6 +35,9 @@ config CSKY
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_32
select GENERIC_GETTIMEOFDAY
select GX6605S_TIMER if CPU_CK610
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_AUDITSYSCALL
@ -46,6 +49,7 @@ config CSKY
select HAVE_DEBUG_KMEMLEAK
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_GENERIC_VDSO
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_ERROR_INJECTION

5
arch/csky/abiv1/inc/abi/regdef.h
View File

@ -4,7 +4,12 @@
#ifndef __ASM_CSKY_REGDEF_H
#define __ASM_CSKY_REGDEF_H
#ifdef __ASSEMBLY__
#define syscallid r1
#else
#define syscallid "r1"
#endif
#define regs_syscallid(regs) regs->regs[9]
#define regs_fp(regs) regs->regs[2]

5
arch/csky/abiv2/inc/abi/regdef.h
View File

@ -4,7 +4,12 @@
#ifndef __ASM_CSKY_REGDEF_H
#define __ASM_CSKY_REGDEF_H
#ifdef __ASSEMBLY__
#define syscallid r7
#else
#define syscallid "r7"
#endif
#define regs_syscallid(regs) regs->regs[3]
#define regs_fp(regs) regs->regs[4]

8
arch/csky/include/asm/clocksource.h Normal file
View File

@ -0,0 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSO_CSKY_CLOCKSOURCE_H
#define __ASM_VDSO_CSKY_CLOCKSOURCE_H
#include <asm/vdso/clocksource.h>
#endif

2
arch/csky/include/asm/vdso.h
View File

@ -5,8 +5,10 @@
#include <linux/types.h>
#ifndef GENERIC_TIME_VSYSCALL
struct vdso_data {
};
#endif
/*
* The VDSO symbols are mapped into Linux so we can just use regular symbol

9
arch/csky/include/asm/vdso/clocksource.h Normal file
View File

@ -0,0 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSO_CSKY_CLOCKSOURCE_H
#define __ASM_VDSO_CSKY_CLOCKSOURCE_H
#define VDSO_ARCH_CLOCKMODES \
VDSO_CLOCKMODE_ARCHTIMER
#endif /* __ASM_VDSO_CSKY_CLOCKSOURCE_H */

114
arch/csky/include/asm/vdso/gettimeofday.h Normal file
View File

@ -0,0 +1,114 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSO_CSKY_GETTIMEOFDAY_H
#define __ASM_VDSO_CSKY_GETTIMEOFDAY_H
#ifndef __ASSEMBLY__
#include <asm/barrier.h>
#include <asm/unistd.h>
#include <abi/regdef.h>
#include <uapi/linux/time.h>
#define VDSO_HAS_CLOCK_GETRES 1
static __always_inline
int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
struct timezone *_tz)
{
register struct __kernel_old_timeval *tv asm("a0") = _tv;
register struct timezone *tz asm("a1") = _tz;
register long ret asm("a0");
register long nr asm(syscallid) = __NR_gettimeofday;
asm volatile ("trap 0\n"
: "=r" (ret)
: "r"(tv), "r"(tz), "r"(nr)
: "memory");
return ret;
}
static __always_inline
long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
register clockid_t clkid asm("a0") = _clkid;
register struct __kernel_timespec *ts asm("a1") = _ts;
register long ret asm("a0");
register long nr asm(syscallid) = __NR_clock_gettime64;
asm volatile ("trap 0\n"
: "=r" (ret)
: "r"(clkid), "r"(ts), "r"(nr)
: "memory");
return ret;
}
static __always_inline
long clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
{
register clockid_t clkid asm("a0") = _clkid;
register struct old_timespec32 *ts asm("a1") = _ts;
register long ret asm("a0");
register long nr asm(syscallid) = __NR_clock_gettime;
asm volatile ("trap 0\n"
: "=r" (ret)
: "r"(clkid), "r"(ts), "r"(nr)
: "memory");
return ret;
}
static __always_inline
int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
register clockid_t clkid asm("a0") = _clkid;
register struct __kernel_timespec *ts asm("a1") = _ts;
register long ret asm("a0");
register long nr asm(syscallid) = __NR_clock_getres_time64;
asm volatile ("trap 0\n"
: "=r" (ret)
: "r"(clkid), "r"(ts), "r"(nr)
: "memory");
return ret;
}
static __always_inline
int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
{
register clockid_t clkid asm("a0") = _clkid;
register struct old_timespec32 *ts asm("a1") = _ts;
register long ret asm("a0");
register long nr asm(syscallid) = __NR_clock_getres;
asm volatile ("trap 0\n"
: "=r" (ret)
: "r"(clkid), "r"(ts), "r"(nr)
: "memory");
return ret;
}
uint64_t csky_pmu_read_cc(void);
static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
const struct vdso_data *vd)
{
#ifdef CONFIG_CSKY_PMU_V1
return csky_pmu_read_cc();
#else
return 0;
#endif
}
static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
{
return _vdso_data;
}
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_VDSO_CSKY_GETTIMEOFDAY_H */

12
arch/csky/include/asm/vdso/processor.h Normal file
View File

@ -0,0 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_VDSO_CSKY_PROCESSOR_H
#define __ASM_VDSO_CSKY_PROCESSOR_H
#ifndef __ASSEMBLY__
#define cpu_relax() barrier()
#endif /* __ASSEMBLY__ */
#endif /* __ASM_VDSO_CSKY_PROCESSOR_H */

22
arch/csky/include/asm/vdso/vsyscall.h Normal file
View File

@ -0,0 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSO_CSKY_VSYSCALL_H
#define __ASM_VDSO_CSKY_VSYSCALL_H
#ifndef __ASSEMBLY__
#include <vdso/datapage.h>
extern struct vdso_data *vdso_data;
static __always_inline struct vdso_data *__csky_get_k_vdso_data(void)
{
return vdso_data;
}
#define __arch_get_k_vdso_data __csky_get_k_vdso_data
#include <asm-generic/vdso/vsyscall.h>
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_VDSO_CSKY_VSYSCALL_H */

2
arch/csky/kernel/perf_event.c
View File

@ -87,7 +87,7 @@ static int csky_pmu_irq;
})
/* cycle counter */
static uint64_t csky_pmu_read_cc(void)
uint64_t csky_pmu_read_cc(void)
{
uint32_t lo, hi, tmp;
uint64_t result;

4
arch/csky/kernel/vdso.c
View File

@ -8,7 +8,11 @@
#include <linux/slab.h>
#include <asm/page.h>
#ifdef GENERIC_TIME_VSYSCALL
#include <vdso/datapage.h>
#else
#include <asm/vdso.h>
#endif
extern char vdso_start[], vdso_end[];

9
arch/csky/kernel/vdso/Makefile
View File

@ -6,12 +6,17 @@ ARCH_REL_TYPE_ABS := R_CKCORE_ADDR32|R_CKCORE_JUMP_SLOT
include $(srctree)/lib/vdso/Makefile
# Symbols present in the vdso
vdso-syms = rt_sigreturn
vdso-syms += rt_sigreturn
vdso-syms += vgettimeofday
# Files to link into the vdso
obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
ccflags-y := -fno-stack-protector
ifneq ($(c-gettimeofday-y),)
CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
endif
ccflags-y := -fno-stack-protector -DBUILD_VDSO32
# Build rules
targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o

4
arch/csky/kernel/vdso/vdso.lds.S
View File

@ -49,6 +49,10 @@ VERSION
LINUX_5.10 {
global:
__vdso_rt_sigreturn;
__vdso_clock_gettime;
__vdso_clock_gettime64;
__vdso_gettimeofday;
__vdso_clock_getres;
local: *;
};
}

28
arch/csky/kernel/vdso/vgettimeofday.c Normal file
View File

@ -0,0 +1,28 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/time.h>
#include <linux/types.h>
int __vdso_clock_gettime(clockid_t clock,
struct old_timespec32 *ts)
{
return __cvdso_clock_gettime32(clock, ts);
}
int __vdso_clock_gettime64(clockid_t clock,
struct __kernel_timespec *ts)
{
return __cvdso_clock_gettime(clock, ts);
}
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
{
return __cvdso_gettimeofday(tv, tz);
}
int __vdso_clock_getres(clockid_t clock_id,
struct old_timespec32 *res)
{
return __cvdso_clock_getres_time32(clock_id, res);
}